Get and use QtMmlWidget

Hellow, i know that there is widget QtMmlWidget, but i dont find it in Qt, who can i download it?
And is there any library for converting ordinary strings like: "(12 +2) / 7" in Mml
In advance thank you for your help!

[quote author="Eddy" date="1323889356"]I recently installed qwt 6.0.1 and there is no need to get it for using qwt anymore[/quote]
Since the MathML package became unmaintained I have stripped it down ( Qwt is interested in the renderer only not the widget ) added a couple of minor patches and committed it to the Qwt repository.

Because this code has a different license as Qwt itsself it is built as extra library ( qwtmathml ). Of course this library is optional and as most users don't use it, it will always be an optional part only.